Problem: Consider All lowercase Alphabets of the English language. Here we consider each alphabet from a to z to have a certain weight. The weight of the alphabet a is considered to be 1, b to be 2, c to be 3 and so on until z has a weight of 26. In short, the weight of the alphabet a is 1, and the weight of all other alphabets is the weight of its previous alphabet + 1. 

Now, you have been given a String S consisting of lowercase English characters. You need to find the summation of weight of each character in this String.  

For example, Consider the String aba
Here, the first character a has a weight of 1, the second character b has 2 and the third character a again has a weight of 1. So the summation here is equal to :
 1  + 2 + 1 =  4    

Input Format:
The first and only line of input contains the String S. 

Output Format 
Print the required answer on a single line

Constraints
 1 ≤ |S| ≤ 1000    

SAMPLE INPUT
aba

SAMPLE OUTPUT
4

Explanation

Explanation for the Sample has been given in the Problem Statement.

Solution (in PYTHON):

Solution:
#!/usr/bin/python

import string
numHash ={}
num = 0
sum = 0

for i in string.lowercase:
        num += 1
        numHash[i] = num

inStr = raw_input('')

if inStr.isalpha() and inStr.islower():

        for j in inStr:
                sum += numHash[j]
        print sum
else:
        print "Improper String"